CVE-2025-54494Public exploitNetwork attack vector

Code execution via unchecked MFER Tag 133 length

Published Aug 25, 2025 · Updated Aug 25, 2025

Stack-based buffer overflow in The BioSig Project libbiosig 3.9.0 and Master Branch (35a819fa) allows attackers to execute code via an MFER file. In the MFER Tag 133 branch of sopen_extended, ifread copies the file-supplied len value into a fixed 128-byte stack buffer without validating the destination size. The branch is reached when a calling application parses a crafted MFER file, enabling attacker-controlled data to overwrite the stack and execute arbitrary code in that process.

CVSS severity9.8
Critical
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in The BioSig Project libbiosig 3.9.0 and Master Branch (35a819fa) allows attackers to execute code via an MFER file. In the MFER Tag 133 branch of sopen_extended, ifread copies the file-supplied len value into a fixed 128-byte stack buffer without validating the destination size. The branch is reached when a calling application parses a crafted MFER file, enabling attacker-controlled data to overwrite the stack and execute arbitrary code in that process.

The record

CVE
CVE-2025-54494
Published
Aug 25, 2025
Updated
Aug 25, 2025
Vendor
The BioSig Project
Product
libbiosig
Classifications
CWE-121, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.9.0
  2. Affected versionversion=Master Branch (35a819fa)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The BioSig Project · libbiosigversion=3.9.0; version=Master Branch (35a819fa)

Published CVSS scores

9.8Cisco TalosCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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